Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 2,851,568	$ 2,222,196	$ 2,851,568	$ 2,222,196	$ 2,235,321
Interest income	25,585	19,219	75,836	56,890
Interest expense	2,220	978	5,787	2,957
Net interest income	23,365	18,241	70,049	53,933
Provision for loan and lease losses	670	233	2,885	2,959
Noninterest income	12,855	12,510	39,637	36,575
Noninterest expense	25,243	22,019	79,486	64,692
Intersegment (revenue) expense	0	0	0	0
Income before income taxes	10,307	8,499	27,315	22,857
Income taxes	2,779	2,264	7,205	5,816
Net income	7,528	6,235	20,110	17,041
Capital expenditures	1,067	436	6,298	2,345
Banking [Member]
Segment Reporting Information [Line Items]
Total assets	2,773,279	2,147,763	2,773,279	2,147,763	2,154,485
Interest income	25,576	19,211	75,811	56,864
Interest expense	2,220	978	5,787	2,959
Net interest income	23,356	18,233	70,024	53,905
Provision for loan and lease losses	670	233	2,885	2,959
Noninterest income	4,932	4,536	14,240	12,153
Noninterest expense	18,408	16,279	59,595	48,800
Intersegment (revenue) expense	(554)	(660)	(1,583)	(1,616)
Income before income taxes	9,764	6,917	23,367	15,915
Income taxes	2,495	1,599	5,471	3,078
Net income	7,269	5,318	17,896	12,837
Capital expenditures	925	313	6,020	2,016
Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	32,793	32,908	32,793	32,908	34,195
Interest income	0	0	0	0
Interest expense	0	0	0	0
Net interest income	0	0	0	0
Provision for loan and lease losses	0	0	0	0
Noninterest income	4,628	4,985	14,216	14,969
Noninterest expense	3,410	3,263	9,903	9,869
Intersegment (revenue) expense	259	214	676	674
Income before income taxes	959	1,508	3,637	4,426
Income taxes	368	580	1,405	1,672
Net income	591	928	2,232	2,754
Capital expenditures	1	25	9	97
Insurance [Member]
Segment Reporting Information [Line Items]
Total assets	23,825	21,930	23,825	21,930	22,930
Interest income	0	0	0	0
Interest expense	0	0	0	0
Net interest income	0	0	0	0
Provision for loan and lease losses	0	0	0	0
Noninterest income	3,345	3,001	11,138	9,030
Noninterest expense	3,109	2,820	9,514	7,320
Intersegment (revenue) expense	295	446	907	942
Income before income taxes	(59)	(265)	717	768
Income taxes	(44)	(105)	282	331
Net income	(15)	(160)	435	437
Capital expenditures	3	16	53	83
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	21,671	19,595	21,671	19,595	$ 23,711
Interest income	9	8	25	26
Interest expense	0	0	0	(2)
Net interest income	9	8	25	28
Provision for loan and lease losses	0	0	0	0
Noninterest income	(50)	(12)	43	423
Noninterest expense	316	(343)	474	(1,297)
Intersegment (revenue) expense	0	0	0	0
Income before income taxes	(357)	339	(406)	1,748
Income taxes	(40)	190	47	735
Net income	(317)	149	(453)	1,013
Capital expenditures	$ 138	$ 82	$ 216	$ 149